I tried to test 0-100 times with a faster car recently (4-5s expected), and three times in a row Dyno/Performance screen failed to record start of the run. iOS GPS + BTLE OBD dongle (5hz) is used. It seems almost as if the launch is too fast for the app to start counting. There seem to be no...

In a number of “drag” runs 0-100 readings differ by about 1s between internal iPhone gps based and BTLE 5hz OBD readings. GPS is faster! Is OBD more accurate due to its 5 time higher frequency of update?

It is difficult to get the exact differences, extrapolation quirks with charts of 1hz...

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